(1) Note -two stages of construction
are covered. The reinforced concrete shell and the wire reinforced tile lining
over the waterproof membrane.

(2) Approved waterproofing membrane, mortar bed
and finish construction shall conform to the general requirements of the Uniform
Plumbing Code. Exception: In short sections where there is no foot traffic,
finished floor may exceed 1/2"
per foot slope.

(3) Each concrete shell shall be filled to its overflow
rim with water and shall remain watertight for not less than twenty-four hours
before inspection and before the finish surface is installed.

(4) The finish surface shall be ceramic tile
installed with Portland cement mortar mixed to a proper consistency in the proportion
of one part cement and four parts mortar sand by volume and having an approved
waterproofing admixture' included. Ceramic tile joints shall be thoroughly grouted
with approved waterproofing grout containing an admixture.

(5) The concave interior surfaces shall be such as
to permit ready cleansing and all corners shall be rounded or at angles not
in excess of 45°. Grout is not acceptable for rounding corners. See details
for approved corners.

(6) Concealed overflow or built-in waste stopper
may be used if designed and approved for this application.

(8) 2000 P.S.I. compressive
strength concrete poured monolithically and having an approved waterproofing
admixture included." Concrete to have not less than six sacks of Portland cement
per batch.

(9) Reinforcing wire, as specified
under materials in this standard or equal, shall be wired together in a self-supporting
manner. Nails shall not be used through the waterproof membrane to fasten wire
reinforcing.

(10) Shower wall in accordance
with Section 909 of the Uniform Plumbing Code.

*Quantities of several approved waterproofing
admixtures required per sack of cement:

Inspection of Work -- All surfaces prepared by other shall be inspected by the
installer before starting tile work and all
satisfactory conditions reported to the Administrative Authority.
Starting tile work by the tile installer shall be considered as acceptance of surfaces prepared by others.

Surfaces -- All surfaces to recieve tile woek shall be clean, structurally
sound and conform in every way to the local building code. (Note: No tile work shall proceed until
the pan and drain construction has been inspected and approved by the Administrative Authority where required.)

Other Membrane -- Where the Administrative Authority approves their use, non-metallic
sub-pans or linings of lead sheets weighing no less than 4 lbs. per sq foot and copper
pans of at least No. 24B & S gauge may be used

Waterproofing Admixture -- The mortar bed of the receptor shall be mixed with a
waterproof admixture approved by the Administrative Authority in the amounts allowed by such approval.

INSTALLATION

Drains -- An approved type drain with sub-drain shall be
installed with every such shower membrane. Flange of each sub-drain
shall be accurately set exactly level with sloping sub-floor and
shall be equipped with a clamping ring or other approved device
to make a tight connection between the membrane and the sub-drain.
The sub-drain shall have weep holes into the waste line. The drain
shall be of such design that there will be not less than 2" depth
from the top of the sub-drain flange to top of the strainer. A ring
of absorbent material must be placed around the weep holes to keep
them open when the finish materials are installed.

Sloping Sub-Floor and MembraneAll lining materials shall
be pitched one quarter (1/4) inch per foot
to weep holes in the subdrain by means of a smooth and solidly formed
sloping sub-base. All such lining materials shall extend upward
on the side walls of the tub to a point not less than (4) inches
above the top of the finished dam or threshold and shall extend
outward over the top of the rough threshold and be turned over and
fastened on the outside face of the rough threshold. All ledge tops
within four inches above the rough threshold shall be covered with
the lining material.

Non-metallic sub-pans or linings shall be built-up on the job site
and shall consist of not less than three (3) layers of standard
grade fifteen (15) pound asphalt impregnated roofing felt. The bottom
layer shall be mopped to the formed sub-base with hot asphalt and
each succeeding layer thoroughly hot mopped to that below, on the
basis of twenty pounds of asphalt per layer per square. All corners
shall be carefully fitted and shall be made strong and water-tight
by folding or lapping, and each corner shall be reinforced with
suitable woven glass fiber webbing hot-mopped in place. All folds,
laps and reinforcing webbing shall extend at least four (4) inches
in all directions from the corner and all glass fiber webbing shall
be of approved type and mesh, producing a tear strength of not less
than fifty (50) pounds per square inch in either direction. Non-metallic
sub-pans or linings may also consist of approved equivalent materials
suitably reinforced and recognized on CTIOA's TESTED
MATERIAL LIST and installed according
to manufac turer's recommended installation procedures.

Linings shall not be nailed or perforated at any point which will
be less than one (1) inch above the finished dam or threshold.

Where lead and copper pans are used as membranes, the installation
shall be made in similar manner as required for felt membranes except
the asphalt moppings, and in addition, the pans shall be insulated
from all concrete and mortar surfaces and from all conducting substances
other than their connecting drain by 15 lb. asphalt saturated felt
or an approved equivalent, hot mopped to the lead or copper pans.
Joints in lead and copper pans shall not be soldered, but shall
be burned or silver brazed respectively.

Tests -- Upon installation all concrete tub shells shall
be tested for water tightness by being filled to the top of the
rough threshold with water for 24 hours to establish their water
tightness.

Roman Bath Tub -- Floor shall be of ceramic tile set in
Portland cement mortar mixed in the proportion of one part Portland
cement to four parts of mortar sand by volume and shall be provided
with an approved shower drain designed to make a water-tight joint
at the floor. The mortar mixture shall be of such consistency that
a troweled surface readily assumes a smooth, slickened surface.
All concrete mortar bases shall be mixed with an approved waterproofing
admixture and properly reinforced with 3.4 galvanized metal lath
or 2" x 2" 16/16 gage or 3" x 3" mesh, 13 x 13 gage or 11/2
x 2 mesh, 16 x 13 gage cold drawn welded steel wire fabric
located in the approximate center of the mortar bed and extending
up the side walls but in no case less than 1" above the finished
threshold. Corners shall be lapped and the reinforcing shall extend
over the threshold and ledges.

The total thickness of the floor mortar shall not be less than 1
1/4" at
any point. The tile floor shall have a minimum of 1/4"
pitch and a maximum of 1/2" pitch toward
the drain per foot. Bath tub walls to a minimum height of 3" and
not less than 1" above the finished dam shall be lined with ceramic
tile set in Portland cement mortar, mixed with an approved waterproofing
admixture.

All wood framed bases shall be designed with a maximum deflection
of 1/360 of the span, including live and dead loads.

Shower walls over Roman bath tubs shall be constructed of dense,
non-absorbent waterproof materials in accordance with the requirements
of Section 909 of the Uniform Plumbing Code.

Roman bath tub enclosures shall be constructed of approved type
shatterproof materials such as wire-glass, laminated safety glass,
fibre-glass reinforced plastics or equivalent materials. Hinged
shower doors shall open outward. Written permission must be obtained
from the Ceramic Tile Institute to reproduce this either in whole
or in part.